Everbuild 903 Black Jack Bitumen Trowel Mastic 5 Litre - 90305

Everbuild 903 Black Jack Trowel Mastic Fibre Reinforced 5 Litre 90305 

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Barcode: 5029347009359

Sika Code: 486991

MPN: 90305

Size: 5 Litre Tin

Colour: Black

Everbuild 903 Black Jack Bitumen Fibre Reinforced Trowel Mastic – Heavy-Duty Waterproofing Solution (5 Litre) a multi use product for roof and gutter repairs, used primarily for patching holes in roofs and bituminous coatings, this multi purpose product forms a surface skin, but the mass below remains non setting stays soft to allow for reasonable movement, Its even been known to be used in boat building for gap filling in hulls of timber boats, it is a professional-grade, high-performance sealing compound designed to tackle heavy-duty waterproofing and sealing applications. With a thick, trowel-grade consistency, this bitumen-based mastic offers superior adhesion and durability, making it ideal for sealing joints, cracks, and gaps in roofing, guttering, pipework, and other external structures. Its weather-resistant formula ensures long-lasting protection against water ingress and harsh environmental conditions.

This 5-litre pack is perfect for medium to large-scale projects and delivers exceptional results for both professional contractors and DIY enthusiasts. Its flexible, durable nature allows it to adapt to surface movements, providing a reliable seal that stands the test of time. Everbuild Black Jack Trowel Mastic is a trusted solution for demanding external waterproofing tasks. Unlike standard sealants, this trowel-grade mastic offers superior thickness, allowing it to easily fill larger gaps and cracks while adhering strongly to various substrates, including concrete, metal, brick, and wood. It’s the ultimate choice for robust, long-lasting waterproofing solutions.

Key Features and Benefits

• Thick Trowel-Grade Formula: Designed for easy application, this mastic spreads smoothly and effectively fills larger voids and cracks.
• Outstanding Waterproofing: Creates a watertight barrier to protect surfaces from moisture, rain, and snow.
• Exceptional Adhesion: Bonds powerfully to diverse materials, including concrete, metal, brick, and timber.
• Durable and Flexible: Adapts to movement in substrates, preventing cracks and ensuring long-term performance.
• Weather and UV Resistant: Withstands the harshest outdoor conditions without degrading or losing effectiveness.
• Versatile Applications: Ideal for roofing, guttering, pipe sealing, and external masonry repairs.
• Cost-Effective 5-Litre Pack: Perfect for both professionals and homeowners handling larger projects.

• Everbuild Trowel Mastic Benefits and Uses

  • Fast drying.
  • Suitable for use with all bituminous surface coatings
  • Remains flexible for long periods after application.
  • Waterproofing, stopping, bedding, bonding and sealing.
  • Adheres to and fills holes in mastic asphalt, roofing felt, corrugated iron, cast iron,
  • fibre cement, slates, lead, copper, zinc, concrete, timber.

The Everbuild 903 Black Jack Bitumen Trowel Mastic (5 Litre) offers an unbeatable combination of durability, flexibility, and ease of use. Whether you’re tackling roofing repairs, sealing drainage systems, or reinforcing masonry, this mastic provides a dependable waterproofing solution that protects against leaks and extends the life of your projects. Designed to perform under the harshest conditions, it’s a must-have for effective outdoor sealing and waterproofing tasks.

Applications of Everbuild 903 Trowel Mastic:

• Roofing Repairs and Waterproofing: The thick, durable consistency is perfect for sealing cracks, joints, and voids in roofing materials, including felt, metal sheets, and concrete roofs.
• Guttering and Drainage Systems: Provides an effective seal for joints in gutters, downpipes, and other drainage components, preventing water leaks and ensuring proper flow.
• Masonry and Structural Repairs: Seals gaps and cracks in concrete, brick, and stone surfaces, offering weatherproofing and structural reinforcement.
• Timber Protection and Sealing: Adds a water-resistant coating to wooden surfaces exposed to outdoor conditions, helping to prevent rot and decay.

How to Use Everbuild 903 Black Jack Bitumen Trowel Mastic:

• Surface Preparation: Clean the surface thoroughly to remove dirt, dust, grease, and loose material. Ensure the surface is dry for optimal adhesion.
• Application: Using a trowel, apply the mastic evenly, spreading it across the surface to fill cracks, joints, or gaps. Ensure full coverage for maximum waterproofing.
• Shaping and Smoothing: Shape the mastic as needed for a neat and professional finish. The thick consistency ensures it stays in place during application.
• Curing: Allow the mastic to cure completely before exposing it to water or heavy loads. Typical curing times range from 24 to 48 hours, depending on conditions.

Cracks and Holes:

• Force the compound into the crack finishing with a 25mm band at a 3mm thickness running the length of the crack so your bridging the crack either side.
  
• For large cracks and holes apply the compound over the area to be treated and embed a closely woven glass fibre membrane into the compound overlap the crack or hole by 50mm.
• Allow to dry and then apply a second coat, fully covering the reinforcing membrane.

Corrugated Iron and Fibre Cement Roofing Sheets:

• If a roof sheet is cracked, clean and prime with Bitumen Flashing Primer

Approximate Usage:

• 3 Litres per meter square at 2mm thick

Questions and Answers:

FAQs Everbuild Black Jack Trowel Mastic:

1. Can Trowel Mastic withstand extreme weather conditions?
Yes, it is designed to provide long-lasting protection against extreme weather conditions, including heavy rain, frost, and UV exposure. Its durable, weatherproof formulation ensures that it remains effective even in harsh environments, making it ideal for outdoor applications such as roofing and gutter repairs.

2. Is this product suitable for sealing large gaps or structural cracks?
Absolutely, the thick, trowel-grade consistency of the mastic makes it perfect for filling larger gaps, cracks, and joints in roofing materials, masonry, or other external surfaces. Its flexible formula adapts to minor movements in substrates, providing a strong and lasting seal without cracking or shrinking.

3. Can this mastic be used on multiple surface types in a single project?
Yes, the mastic adheres effectively to a wide range of surfaces, including concrete, brick, metal, and wood. This versatility makes it an excellent choice for projects involving multiple materials, such as sealing where roofing meets masonry or protecting wooden structures exposed to the elements.

4. How can I ensure a professional finish when using this mastic?
To achieve a neat and professional finish, ensure the surface is clean and dry before application. Use a trowel to spread the mastic evenly, focusing on filling all cracks and voids completely. After application, shape and smooth the surface with the trowel to remove excess material and achieve a uniform appearance. Allow sufficient curing time (24–48 hours) before exposing it to water or heavy use for the best results.

Always Read the Official Technical Data sheet prior to use to make sure you have all the details are correct and that there have not been any changes to instructions.

(Please note that tins will get dented in transit and this is not a reason for return please do not purchase tined products if this is an issue for yourself.)